I really don't know how toowrk it out on paper, I'm afraid. I just looked at it, and somehow knew that the answers are 7 and 9.
It is a.
You multiply 9.3 and 2.5 together and get 23.25
Then just add the exponents 6+3 is 9
So the answer is 23.25 x 10^9
Hope this helps!!
Your answer is 0.0909090909 if I'm not mistaken.
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If we make his age equal to x, the. We can set up the equation X=4(x-15)
